CVE-2025-1221 DoS in Zigbee device due to heavy traffic
Heavy Zigbee traffic causes a denial of service in SiLabs EmberZNet radio coprocessors, requiring a hard reset to recover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-1221?
CVE-2025-1221 is a medium-severity denial of service vulnerability in silabs.com Zigbee, published on 30 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Zigbee Radio Co-Processor (RCP), which is using SiLabs EmberZNet Zigbee stack, was unable to send messages to the host system (CPCd) due to heavy Zigbee traffic, resulting in a Denial of Service (DoS) attack, Only hard reset will bring the device to normal operation
Weakness: CWE-667
Which versions are affected by CVE-2025-1221?
How do I fix CVE-2025-1221?
No fix has been published for CVE-2025-1221 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-1221 being exploited?
There is no known exploitation of CVE-2025-1221 in the wild and no public exploit code.
Sources
Also known as GHSA-542q-g93g-wjg9.